Process of and apparatus for reducing wood to paper-pulp



(m -X H. A. PRAMBAGH.

Process of and Apparatus for Reducing Wood to Paper Pulp. No. 239,040. Patented March 22.1881.

UNITED STATES PATENT OFFICE.

HENRY A. FRAMBAGH, OF KAUKAUNA, WISCONSIN.

PROCESS OF AND APPARATUS FOR REDUCING WOOD TO PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 239,040, dated March 22, 1881,

Application filed December 15. 1880.

To all whom it may concern:

Be it known that I, HENRY A. FRAMBAOH, of Kaukaunaffin the county of Outagamie and State of Wisconsin, have invented certain new and useful Improvements in Process of and Apparatusfor Reducing Wood to Paper- Pulp; and I do herebydeclare that the followingisa full, clear, and exact description of the im'ention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawing, and to the letters of reference marked thereon, which form a part of this specification.

The accompanying drawing is a diagram illustrating an arrangement of apparatus by which my improvement in the process of treating wood for-reduction t paper-pulp can be applied.

My improvement consists in applying steam to the wood to be reduced while in the cells, and simultaneously applying hot water to the surface of the grindstone at that part where the grinding is taking place, such water being forcibly thrown against the stone by means of an injectorto keep the grinding-surface clean and in the best condition for the performance of its work. By the use of steam and hot Water in the manner and order stated a pulp of strong fiber and excellent quality is obtained at an economical expenditure of power.

In the drawing, S marks a pulp-grinding stone, of any preferred kind and dimensions, turning in the tank E.

O G are the cells for the reception of the wood, previously sawed and split to the proper size.

P P are the plunger-s, operated in any usual manner to apply the wood to the surface of the grindstone S.

Into the cells C C, respectively, steam is in- (No model.)

troduced by pipes c d communicating by pipes a b with a boiler (not shown) of size to afford the proper steam-supply.

T is an open tank supplied with water through pipe A. The water in this tank is kept hot by a steam-coil communicating at c with steampipe a. From the bottom of the tank a pipe, B, communicates with pipe D through a steam-injector, I, which projects the hot water with considerable force against the surface of the grindstone S from the lower end of pipe D.

It will be seen from this construction that the wood while in the cells is constantly subjected to the softening and disintegrating action of steam, and when it reaches the surface of the grindstone is ground under a strong current of hot water, and falls into the tank E ready for the usual after treatment for conversion into paper.

I claim--- 1. As a new process of treating wood for reduction to paper-pulp, subjecting it while in the cells to the action of steam, and then grinding it under a strong current of hot water constantly flowing over the grinding-surface of the reducing-stone, all substantially in the manner described.

2 The combination in a wood-pulp mill, of 

